Islamabad - At least seven people, including four policemen, were killed in twin attacks in north-western Pakistan on Sunday, officials said.
In the first incident, gunmen opened fire at a police checkpoint in the city of Dera Ismail Khan and killed two officers.
A suicide bomber then blew themselves up outside a hospital gate as the ambulance carrying the two officers arrived.
City police spokesman Arshad Ali said at least five people were killed in the second attack, including two policemen. Another 17 people were wounded.
Ali said it was not yet clear whether the suicide bomber was male or female, although there were early indications that a woman carried out the blast.